x1= column vector (2, 1) x2= column vector (4, 3) x3= column vector (7, -3) Why must x1, x2, and x3 be linearly dependent? x1 and x2 span R^2. The basis are these two columns vectors: (3/2, -1/2), (-2, 1) Since x1 and x2 form the basis, x3 can be written as a linear combination of these vectors. Is that it? or correct?